Research — Illustrative (draft, unvalidated)
DER cease-to-energize — auto
The trip time sweeps from 0 to 5 s. On the first pass the default 2.0 s maximum applies and the verdict flips right at 2.0 s. Each later pass applies an illustrative utility override: 1.0 s (tighter), 3.0 s and 5.0 s (loosened by mutual agreement, up to the Clause 8.1.2 ceiling).
DER trip time
0 smaximum5 s
Reading —
Timeline · island forms at t = 0, DER trip time, operative maximum
Cease-to-energize status
Measured
Maximum
Margin
How the check read it
Client-side port:the logic and table in this page are a TypeScript port of the harness function, checked against values exported from the Python tests. Not a live API call. Domain maturity, quoted from the research page: “Draft, unvalidated. No DER interconnection or protection engineer has reviewed it; every function has only an AI-assisted pre-review. IEEE 1547-2018 is paywalled, so subclause numbers are mostly single-source. The FERC screens are confirmed against authoritative copies.” Clause 8.1.1's exact sentence and sub-subclause digit are moderate-confidence secondary corroboration, not read from a primary copy, and IEEE 1547-2018 is paywalled. The 1.0 s, 3.0 s and 5.0 s overrides are illustrative inputs: the harness currently ships no real utility override data. The “before the first reclose interval” nuance is disputed between secondary sources and is deliberately not modeled.Real function this maps to:
check_der_cease_to_energize_time.Not modeled: only the cease-to-energize trip-time comparison, not the harness's other 14 interconnection checks. Also not modeled: how the island is detected, the DER's actual response, the reclose-interval nuance, and any real utility's override value or jurisdiction edition lookup. The sweep order is staged.See also:Cease-to-energize, interactive · Ride-through, auto sweep